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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69fbd4dec724b70ed2a42b3d4f451e28ce45b79c76cee1eaf5676d6b0c13d05' 
  AND token = '3l2z+HvVg5VKMjzTauyBmS19CbjbDDl8pHvBWqmKxd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}